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TPS51513RHBT Datasheet(PDF) 21 Page - Texas Instruments

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Part No. TPS51513RHBT
Description  SINGLE PHASE, D-CAP SYNCHRONOUS BUCK CONTROLLER
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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TPS51513RHBT Datasheet(HTML) 21 Page - Texas Instruments

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–25
1.05
1.00
25
1.15
1.10
1.40
1.35
1.50
1.45
1.25
1.20
1.30
0
75
125
100
50
R
CS(eff)
R
T
J – Temperature – °C
P _ N
CS(eff )
DCR
SEQU
P _ N
R
R
R
R
R
=
´
+
(
)
PAR
NTC
SERIES
P _ N
PAR
NTC
SERIES
R
R
R
R
R
R
R
´
+
=
+
+
( )
( )
RIPPLE
MAX
TRIPSEL min
CS eff
I
V
R
I
2
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TPS51513
www.ti.com
SLUS956A – JUNE 2009 – REVISED FEBRUARY 2010
EFFECTIVE OUTPUT RESISTANCE
vs
TEMPERATURE
Figure 11.
In this case, the nearest standard values are:
RSEQU = 2.61 kΩ;
RSERIES = 3.16 kΩ;
RPAR = 12.7 kΩ
CSENSE =180 nF
Note the effective divider ratio for the inductor DCR. The effective current sense resistance (RCS_Eff) is:
(12)
RP_N is the series/parallel combination of RNTC, RSERIES and RPAR.
(13)
RCS_Eff is 1.31mΩ. Choose the value of TRIPSEL so the minimum TRIPSEL voltage is just above the voltage
across the current sense pins at the valley point of the current waveform. Maximize the value of RCS_Eff for
improved circuit performance.
(14)
In this case, the TRIPSEL minimum value needs to be greater than 29.8 mV; the next highest value in the
parameter table is 31.4 mV. This value corresponds to connecting TRIPSEL to VREF and RSLEW to VREF.
Step Six: Determine the output capacitor configuration. In general, for a system with a load-line, the ESR of the
output capacitors should be equal to or less than the load-line value. The magnitude and slew rate of the
dynamic load also drives the capacitor choice, as does the inductor selection. For highly dynamic systems, a
successful design has a combination of bulk and ceramic capacitance totaling approximately 1000mF.
Copyright © 2009–2010, Texas Instruments Incorporated
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